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    <title>topolis integration</title>
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          <h4 id="title">topolis integration</h4>
          <div id="map" class="map"></div>

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      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Example on how to use topolis with OpenLayers.</p>
          <div id="docs"><p>Example showing the integration of <a href="https://github.com/bjornharrtell/topolis">topolis</a> with OpenLayers, enabling creating and editing topological geometry. Standard interaction draws edges, snapping to existing edges. Delete an edge by drawing a new edge crossing the one to delete.</p>
</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.geom.LineString.html" title="API documentation for ol.geom.LineString">ol.geom.LineString</a></li>,<li><a href="../apidoc/ol.geom.Polygon.html" title="API documentation for ol.geom.Polygon">ol.geom.Polygon</a></li>,<li><a href="../apidoc/ol.interaction.Draw.html" title="API documentation for ol.interaction.Draw">ol.interaction.Draw</a></li>,<li><a href="../apidoc/ol.interaction.Snap.html" title="API documentation for ol.interaction.Snap">ol.interaction.Snap</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Text.html" title="API documentation for ol.style.Text">ol.style.Text</a></li>,<li><a href="../apidoc/ol.control.MousePosition.html" title="API documentation for ol.control.MousePosition">ol.control.MousePosition</a></li></ul></div>
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        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">topolis integration</textarea>
          <textarea class="hidden" name="description">Example on how to use topolis with OpenLayers.</textarea>
          <textarea class="hidden" name="js">// this example uses topolis and toastr for which we don&#x27;t have an externs file.

var raster &#x3D; new ol.layer.Tile({
  source: new ol.source.OSM()
});

var nodes &#x3D; new ol.source.Vector({wrapX: false});
var nodesLayer &#x3D; new ol.layer.Vector({
  source: nodes,
  style: function(f) {
    var style &#x3D; new ol.style.Style({
      image: new ol.style.Circle({
        radius: 8,
        fill: new ol.style.Fill({color: &#x27;rgba(255, 0, 0, 0.2)&#x27;}),
        stroke: new ol.style.Stroke({color: &#x27;red&#x27;, width: 1})
      }),
      text: new ol.style.Text({
        text: f.get(&#x27;node&#x27;).id.toString(),
        fill: new ol.style.Fill({color: &#x27;red&#x27;}),
        stroke: new ol.style.Stroke({
          color: &#x27;white&#x27;,
          width: 3
        })
      })
    });
    return [style];
  }
});

var edges &#x3D; new ol.source.Vector({wrapX: false});
var edgesLayer &#x3D; new ol.layer.Vector({
  source: edges,
  style: function(f) {
    var style &#x3D; new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: &#x27;blue&#x27;,
        width: 1
      }),
      text: new ol.style.Text({
        text: f.get(&#x27;edge&#x27;).id.toString(),
        fill: new ol.style.Fill({color: &#x27;blue&#x27;}),
        stroke: new ol.style.Stroke({
          color: &#x27;white&#x27;,
          width: 2
        })
      })
    });
    return [style];
  }
});

var faces &#x3D; new ol.source.Vector({wrapX: false});
var facesLayer &#x3D; new ol.layer.Vector({
  source: faces,
  style: function(f) {
    var style &#x3D; new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: &#x27;black&#x27;,
        width: 1
      }),
      fill: new ol.style.Fill({
        color: &#x27;rgba(0, 255, 0, 0.2)&#x27;
      }),
      text: new ol.style.Text({
        font: &#x27;bold 12px sans-serif&#x27;,
        text: f.get(&#x27;face&#x27;).id.toString(),
        fill: new ol.style.Fill({color: &#x27;green&#x27;}),
        stroke: new ol.style.Stroke({
          color: &#x27;white&#x27;,
          width: 2
        })
      })
    });
    return [style];
  }
});

var map &#x3D; new ol.Map({
  layers: [raster, facesLayer, edgesLayer, nodesLayer],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [-11000000, 4600000],
    zoom: 16
  })
});

var topo &#x3D; topolis.createTopology();

topo.on(&#x27;addnode&#x27;, nodeToFeature);
topo.on(&#x27;removenode&#x27;, function(e) {
  removeElementFeature(nodes, e);
});
topo.on(&#x27;addedge&#x27;, edgeToFeature);
topo.on(&#x27;modedge&#x27;, function(e) {
  var feature &#x3D; edges.getFeatureById(e.id);
  feature.setGeometry(new ol.geom.LineString(e.coordinates));
});
topo.on(&#x27;removeedge&#x27;, function(e) {
  removeElementFeature(edges, e);
});
topo.on(&#x27;addface&#x27;, faceToFeature);
topo.on(&#x27;removeface&#x27;, function(e) {
  removeElementFeature(faces, e);
});

function removeElementFeature(source, element) {
  var feature &#x3D; source.getFeatureById(element.id);
  source.removeFeature(feature);
}

function nodeToFeature(node) {
  var feature &#x3D; new ol.Feature({
    geometry: new ol.geom.Point(node.coordinate),
    node: node
  });
  feature.setId(node.id);
  nodes.addFeature(feature);
}

function edgeToFeature(edge) {
  var feature &#x3D; new ol.Feature({
    geometry: new ol.geom.LineString(edge.coordinates),
    edge: edge
  });
  feature.setId(edge.id);
  edges.addFeature(feature);
}

function faceToFeature(face) {
  var coordinates &#x3D; topo.getFaceGeometry(face);
  var feature &#x3D; new ol.Feature({
    geometry: new ol.geom.Polygon(coordinates),
    face: face
  });
  feature.setId(face.id);
  faces.addFeature(feature);
}

function createNode(topo, coord) {
  var node;
  var existingEdge &#x3D; topo.getEdgeByPoint(coord, 5)[0];
  if (existingEdge) {
    node &#x3D; topo.modEdgeSplit(existingEdge, coord);
  } else {
    node &#x3D; topo.addIsoNode(coord);
  }
  return node;
}

function onDrawend(e) {
  var edgeGeom &#x3D; e.feature.getGeometry().getCoordinates();
  var startCoord &#x3D; edgeGeom[0];
  var endCoord &#x3D; edgeGeom[edgeGeom.length - 1];
  var start, end;
  try {
    start &#x3D; topo.getNodeByPoint(startCoord);
    end &#x3D; topo.getNodeByPoint(endCoord);
    var edgesAtStart &#x3D; topo.getEdgeByPoint(startCoord, 5);
    var edgesAtEnd &#x3D; topo.getEdgeByPoint(endCoord, 5);
    var crossing &#x3D; topo.getEdgesByLine(edgeGeom);
    if (crossing.length &#x3D;&#x3D;&#x3D; 1 &amp;&amp; !start &amp;&amp; !end &amp;&amp; edgesAtStart.length &#x3D;&#x3D;&#x3D; 0 &amp;&amp; edgesAtEnd.length &#x3D;&#x3D;&#x3D; 0) {
      topo.remEdgeNewFace(crossing[0]);
      start &#x3D; crossing[0].start;
      if (start.face) {
        topo.removeIsoNode(start);
      }
      end &#x3D; crossing[0].end;
      if (end.face) {
        topo.removeIsoNode(end);
      }
      return;
    }
    if (!start) {
      start &#x3D; createNode(topo, startCoord);
      edgeGeom[0] &#x3D; start.coordinate;
    }
    if (!end) {
      end &#x3D; createNode(topo, endCoord);
      edgeGeom[edgeGeom.length - 1] &#x3D; end.coordinate;
    }
    topo.addEdgeNewFaces(start, end, edgeGeom);
  } catch (e) {
    toastr.warning(e.toString());
  }
}

var draw &#x3D; new ol.interaction.Draw({
  type: &#x27;LineString&#x27;
});
draw.on(&#x27;drawend&#x27;, onDrawend);
map.addInteraction(draw);
var snap &#x3D; new ol.interaction.Snap({
  source: edges
});
map.addInteraction(snap);
map.addControl(new ol.control.MousePosition());
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.6.5/css/ol.css,https://openlayers.org/en/v4.6.5/build/ol.js,https://cdn.rawgit.com/bjornharrtell/topolis/releases/0.1.1/topolis.min.js,https://code.jquery.com/jquery-3.1.1.min.js,https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.js,https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.css">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;topolis integration&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://cdn.rawgit.com/bjornharrtell/topolis/releases/0.1.1/topolis.min.js&quot;&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://code.jquery.com/jquery-3.1.1.min.js&quot;&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.js&quot;&gt;&lt;/script&gt;
    &lt;link rel&#x3D;&quot;stylesheet&quot; href&#x3D;&quot;https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.css&quot;&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script&gt;
      // this example uses topolis and toastr for which we don&#x27;t have an externs file.

      var raster &#x3D; new ol.layer.Tile({
        source: new ol.source.OSM()
      });

      var nodes &#x3D; new ol.source.Vector({wrapX: false});
      var nodesLayer &#x3D; new ol.layer.Vector({
        source: nodes,
        style: function(f) {
          var style &#x3D; new ol.style.Style({
            image: new ol.style.Circle({
              radius: 8,
              fill: new ol.style.Fill({color: &#x27;rgba(255, 0, 0, 0.2)&#x27;}),
              stroke: new ol.style.Stroke({color: &#x27;red&#x27;, width: 1})
            }),
            text: new ol.style.Text({
              text: f.get(&#x27;node&#x27;).id.toString(),
              fill: new ol.style.Fill({color: &#x27;red&#x27;}),
              stroke: new ol.style.Stroke({
                color: &#x27;white&#x27;,
                width: 3
              })
            })
          });
          return [style];
        }
      });

      var edges &#x3D; new ol.source.Vector({wrapX: false});
      var edgesLayer &#x3D; new ol.layer.Vector({
        source: edges,
        style: function(f) {
          var style &#x3D; new ol.style.Style({
            stroke: new ol.style.Stroke({
              color: &#x27;blue&#x27;,
              width: 1
            }),
            text: new ol.style.Text({
              text: f.get(&#x27;edge&#x27;).id.toString(),
              fill: new ol.style.Fill({color: &#x27;blue&#x27;}),
              stroke: new ol.style.Stroke({
                color: &#x27;white&#x27;,
                width: 2
              })
            })
          });
          return [style];
        }
      });

      var faces &#x3D; new ol.source.Vector({wrapX: false});
      var facesLayer &#x3D; new ol.layer.Vector({
        source: faces,
        style: function(f) {
          var style &#x3D; new ol.style.Style({
            stroke: new ol.style.Stroke({
              color: &#x27;black&#x27;,
              width: 1
            }),
            fill: new ol.style.Fill({
              color: &#x27;rgba(0, 255, 0, 0.2)&#x27;
            }),
            text: new ol.style.Text({
              font: &#x27;bold 12px sans-serif&#x27;,
              text: f.get(&#x27;face&#x27;).id.toString(),
              fill: new ol.style.Fill({color: &#x27;green&#x27;}),
              stroke: new ol.style.Stroke({
                color: &#x27;white&#x27;,
                width: 2
              })
            })
          });
          return [style];
        }
      });

      var map &#x3D; new ol.Map({
        layers: [raster, facesLayer, edgesLayer, nodesLayer],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [-11000000, 4600000],
          zoom: 16
        })
      });

      var topo &#x3D; topolis.createTopology();

      topo.on(&#x27;addnode&#x27;, nodeToFeature);
      topo.on(&#x27;removenode&#x27;, function(e) {
        removeElementFeature(nodes, e);
      });
      topo.on(&#x27;addedge&#x27;, edgeToFeature);
      topo.on(&#x27;modedge&#x27;, function(e) {
        var feature &#x3D; edges.getFeatureById(e.id);
        feature.setGeometry(new ol.geom.LineString(e.coordinates));
      });
      topo.on(&#x27;removeedge&#x27;, function(e) {
        removeElementFeature(edges, e);
      });
      topo.on(&#x27;addface&#x27;, faceToFeature);
      topo.on(&#x27;removeface&#x27;, function(e) {
        removeElementFeature(faces, e);
      });

      function removeElementFeature(source, element) {
        var feature &#x3D; source.getFeatureById(element.id);
        source.removeFeature(feature);
      }

      function nodeToFeature(node) {
        var feature &#x3D; new ol.Feature({
          geometry: new ol.geom.Point(node.coordinate),
          node: node
        });
        feature.setId(node.id);
        nodes.addFeature(feature);
      }

      function edgeToFeature(edge) {
        var feature &#x3D; new ol.Feature({
          geometry: new ol.geom.LineString(edge.coordinates),
          edge: edge
        });
        feature.setId(edge.id);
        edges.addFeature(feature);
      }

      function faceToFeature(face) {
        var coordinates &#x3D; topo.getFaceGeometry(face);
        var feature &#x3D; new ol.Feature({
          geometry: new ol.geom.Polygon(coordinates),
          face: face
        });
        feature.setId(face.id);
        faces.addFeature(feature);
      }

      function createNode(topo, coord) {
        var node;
        var existingEdge &#x3D; topo.getEdgeByPoint(coord, 5)[0];
        if (existingEdge) {
          node &#x3D; topo.modEdgeSplit(existingEdge, coord);
        } else {
          node &#x3D; topo.addIsoNode(coord);
        }
        return node;
      }

      function onDrawend(e) {
        var edgeGeom &#x3D; e.feature.getGeometry().getCoordinates();
        var startCoord &#x3D; edgeGeom[0];
        var endCoord &#x3D; edgeGeom[edgeGeom.length - 1];
        var start, end;
        try {
          start &#x3D; topo.getNodeByPoint(startCoord);
          end &#x3D; topo.getNodeByPoint(endCoord);
          var edgesAtStart &#x3D; topo.getEdgeByPoint(startCoord, 5);
          var edgesAtEnd &#x3D; topo.getEdgeByPoint(endCoord, 5);
          var crossing &#x3D; topo.getEdgesByLine(edgeGeom);
          if (crossing.length &#x3D;&#x3D;&#x3D; 1 &amp;&amp; !start &amp;&amp; !end &amp;&amp; edgesAtStart.length &#x3D;&#x3D;&#x3D; 0 &amp;&amp; edgesAtEnd.length &#x3D;&#x3D;&#x3D; 0) {
            topo.remEdgeNewFace(crossing[0]);
            start &#x3D; crossing[0].start;
            if (start.face) {
              topo.removeIsoNode(start);
            }
            end &#x3D; crossing[0].end;
            if (end.face) {
              topo.removeIsoNode(end);
            }
            return;
          }
          if (!start) {
            start &#x3D; createNode(topo, startCoord);
            edgeGeom[0] &#x3D; start.coordinate;
          }
          if (!end) {
            end &#x3D; createNode(topo, endCoord);
            edgeGeom[edgeGeom.length - 1] &#x3D; end.coordinate;
          }
          topo.addEdgeNewFaces(start, end, edgeGeom);
        } catch (e) {
          toastr.warning(e.toString());
        }
      }

      var draw &#x3D; new ol.interaction.Draw({
        type: &#x27;LineString&#x27;
      });
      draw.on(&#x27;drawend&#x27;, onDrawend);
      map.addInteraction(draw);
      var snap &#x3D; new ol.interaction.Snap({
        source: edges
      });
      map.addInteraction(snap);
      map.addControl(new ol.control.MousePosition());
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>
    </div>

    <script src="./resources/common.js"></script>
    <script src="./resources/prism/prism.min.js"></script>
    <script src="loader.js?id=topolis"></script>
  </body>
  <script>
  var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
  fetch(packageUrl).then(function(response) {
    return response.json();
  }).then(function(json) {
    var latestVersion = json.version;
    document.getElementById('latest-version').innerHTML = latestVersion;
    var url = window.location.href;
    var branchSearch = url.match(/\/([^\/]*)\/examples\//);
    var cookieText = 'dismissed=-' + latestVersion + '-';
    var dismissed = document.cookie.indexOf(cookieText) != -1;
    if (!dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '4.6.5' != latestVersion) {
      var link = url.replace(branchSearch[0], '/latest/examples/');
      fetch(link, {method: 'head'}).then(function(response) {
        var a = document.getElementById('latest-link');
        a.href = response.status == 200 ? link : '../../latest/examples/';
      });
      var latestCheck = document.getElementById('latest-check');
      latestCheck.style.display = '';
      document.getElementById('latest-dismiss').onclick = function() {
        latestCheck.style.display = 'none';
        document.cookie = cookieText;
      }
    }
  });
  </script>
</html>
